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ALPHA_E.asm
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ALPHA_E.asm
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; ---------------------------------------------------------------------------
ptr16 struc ; (sizeof=0x4) ; XREF: seg000:executeable_bufferr
; seg000:some_game_ptrr ...
ofs dw ? ; XREF: EXE_HEADER_sub_2:do_relocater
; GAME_START_sub_6+13w ...
segm dw ? ; XREF: EXE_HEADER_sub_2+CBr
; GAME_START_sub_6+63r ...
ptr16 ends
; ---------------------------------------------------------------------------
gfx_block_t struc ; (sizeof=0x18)
filename db 18 dup(?) ; XREF: start_0+30Ao start_0+324o ...
byte_12h db ? ; XREF: read_some_file_sub_4+54r
byte_13h db ? ; XREF: GAME_START_sub_7+1Dr
; start_0+2FBr ...
byte_14h db ? ; XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+5r
byte_15h db ?
word_16h dw ? ; XREF: START_GAME_FEATURE_FLAG_STUFF_sub_21r
gfx_block_t ends
; ---------------------------------------------------------------------------
CommandTail struc ; (sizeof=0x80) ; XREF: sPSPr
count db ?
buffer db 127 dup(?)
CommandTail ends
; ---------------------------------------------------------------------------
; Program segment prefix from dosbox source
sPSP struc ; (sizeof=0x100)
exit_instructions db 2 dup(?) ; XREF: EXE_HEADER_sub_2+140o
; GAME_START_sub_6+13o
next_seg dw ?
fill_1 db ?
far_call db ?
cpm_entry ptr16 ?
int_22 ptr16 ?
int_23 ptr16 ?
int_24 ptr16 ?
psp_parent dw ?
files db 20 dup(?)
environment dw ?
stack dd ?
max_files dw ?
file_table ptr16 ?
prev_psp ptr16 ?
interim_flag db ?
truename_flag db ?
nn_flags dw ?
version_dos dw ?
fill_2 db 14 dup(?)
service db 3 dup(?)
fill_3 db 9 dup(?)
fcb1 db 16 dup(?)
fcb2 db 16 dup(?)
fill_4 db 4 dup(?)
cmdtail_or_dta CommandTail ? ; XREF: GAME_START_sub_6+2Eo ; or DTA
sPSP ends
; ---------------------------------------------------------------------------
; exe header from dosbox source
EXE_Header struc ; (sizeof=0x1C)
signature dw ? ; XREF: EXE_HEADER_sub_2:loc_560r
extrabytes dw ?
pages dw ?
relocations dw ? ; XREF: EXE_HEADER_sub_2+BCr
headersize dw ? ; XREF: EXE_HEADER_sub_2:loc_562r
minmemory dw ?
maxmemory dw ?
initSS dw ? ; XREF: EXE_HEADER_sub_2+E7r
initSP dw ? ; XREF: EXE_HEADER_sub_2+DFr
checksum dw ?
initIP dw ? ; XREF: EXE_HEADER_sub_2+FBr
initCS dw ? ; XREF: EXE_HEADER_sub_2+F1r
reloctable dw ? ; XREF: EXE_HEADER_sub_2+C2r
overlay dw ?
EXE_Header ends
;
; +-------------------------------------------------------------------------+
; | This file has been generated by The Interactive Disassembler (IDA) |
; | Copyright (c) 2013 Hex-Rays, <support@hex-rays.com> |
; | Licensed to: Freeware version |
; +-------------------------------------------------------------------------+
;
; Input MD5 : 7E165FC5FD1AEC1482BC915AB4053D36
; Input CRC32 : E357F62E
; File Name : D:\projects\fun\dos_games_rev\002297_alpha_waves\disk1\ALPHA_E.COM
; Format : MS-DOS COM-file
; Base Address: 1000h Range: 10100h-11BC0h Loaded length: 1AC0h
.286
.model tiny
; ===========================================================================
; Segment type: Pure code
seg000 segment byte public 'CODE'
assume cs:seg000
org 100h
assume es:nothing, ss:nothing, ds:seg000
; =============== S U B R O U T I N E =======================================
; Attributes: noreturn thunk
public start
start proc near
jmp start_0
start endp
; ---------------------------------------------------------------------------
CGA_string db 'CGA' ; DATA XREF: seg000:gfx_string_offset_tableo
db 5 dup(1) ; 0
EGA_string db 'EGA' ; DATA XREF: seg000:gfx_string_offset_tableo
db 5 dup(1) ; 0
TANDY_string db 'TANDY' ; DATA XREF: seg000:gfx_string_offset_tableo
db 5 dup(1) ; 0
HERCULES_string db 48h ; H ; DATA XREF: seg000:gfx_string_offset_tableo
db 45h ; E
db 52h ; R
db 43h ; C
db 55h ; U
db 4Ch ; L
db 45h ; E
db 53h ; S
VGA_string db 'VGA' ; DATA XREF: seg000:gfx_string_offset_tableo
db 5 dup(1) ; 0
gfx_string_offset_table dw offset CGA_string, offset EGA_string, offset TANDY_string; 0
; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+3Br
dw offset HERCULES_string, offset VGA_string; 3 ; "CGA"
gfx_type_array db 2, 3, 40h, 80h, 5 ; 0
; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+Er
gfx_type_array2 db 2, 3, 2, 1, 5 ; 0
; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+2Cr
; __int16 someway_cs_registe_value1
someway_cs_registe_value1 dw 0 ; DATA XREF: GAME_START_sub_7+79w
; GAME_START_sub_7+8Do
db 80h, 0
someway_cs_registe_value2 dw 0 ; DATA XREF: GAME_START_sub_7+7Ew
db 5Ch, 0
someway_cs_registe_value3 dw 0 ; DATA XREF: GAME_START_sub_7+83w
db 6Ch, 0
someway_cs_registe_value4 dw 0 ; DATA XREF: GAME_START_sub_7+88w
; __int16 executeable_buffer
executeable_buffer ptr16 <0> ; DATA XREF: read_some_file_sub_4+20r
; read_some_file_sub_4+3Er ...
;
;
;
; --------------
;
;
; for 4 executables (in this order)
;
; 1. adlib tsr
; 2. tandy tsr
; 3. pc buz tsr
; 4. game
;
;
; --------------
; __int16 some_game_ptr
some_game_ptr ptr16 <0> ; DATA XREF: read_some_file_sub_4+D7w
; read_some_file_sub_4+1B5r ...
word_44 dw 0 ; DATA XREF: read_some_file_sub_4+25w
; read_some_file_sub_4+C2w ...
word_45 dw 0 ; DATA XREF: read_some_file_sub_4+2Cw
; read_some_file_sub_4+C7w ...
far_ptr3 ptr16 <0> ; DATA XREF: GAME_START_sub_5+4Br
; GAME_START_sub_6+3w ...
another_far_ptr ptr16 <0> ; DATA XREF: read_some_file_sub_4:loc_580w
; read_some_file_sub_4+145r ...
somway_exe_buffer_seg dw 0 ; DATA XREF: GAME_START_sub_5+Dr
; GAME_START_sub_5+63r ...
some_register_ss_value dw 0 ; DATA XREF: GAME_START_sub_7+96w
; GAME_START_sub_7+A9r
some_register_sp_value dw 0 ; DATA XREF: GAME_START_sub_7+91w
; GAME_START_sub_7+A4r
maybe_10_ptr ptr16 0Ah dup(<0>) ; DATA XREF: GAME_START_sub_6+5Do
; start_0+35o ...
; ----
;
; https://wiki.osdev.org/MZ is sizeof 28h
;
;
; seems do be always 0???
;
;
; ----
also_a_pointer ptr16 <0> ; DATA XREF: read_some_file_sub_4+137w
; read_some_file_sub_4:loc_584w ...
byte_55 db 0 ; DATA XREF: EXE_HEADER_sub_2+1r
; EXE_HEADER_sub_2+5Cr ...
byte_56 db 0 ; DATA XREF: JOYSTICK_STUFF2_sub_30+7w
; CALIBRATE_JOYSTICK_STUFF_sub_31+Cr ...
byte_57 db 0 ; DATA XREF: GAME_START_sub_3+42o
; GAME_START_sub_3+7Cr ...
byte_569 db 0 ; DATA XREF: GAME_START_sub_3:loc_577r
word_60 dw 0 ; DATA XREF: GAME_START_sub_3+76r
; GAME_START_sub_3+EDr ...
db 4 dup(0)
another_pointer2 ptr16 <0> ; DATA XREF: GAME_START_sub_3+49r
; GAME_START_sub_3+61w ...
word_62 dw 0 ; DATA XREF: EXE_HEADER_sub_2+17w
; EXE_HEADER_sub_2+9Ar ...
some_game_pointer_seg dw 0 ; DATA XREF: EXE_HEADER_sub_2+1Cw
; EXE_HEADER_sub_2+95r ...
new_psp_seg dw 0 ; DATA XREF: EXE_HEADER_sub_2+2Dr
; EXE_HEADER_sub_2+103r ...
; ----
;
; 4x set with int 21h/ah=26h
;
; 1. adlib tsr
; 2. tandy tsr
; 3. pc buz tsr
; 4. game
;
;
; ----
word_558 dw 0 ; DATA XREF: EXE_HEADER_sub_2:loc_557w
some_register_cs_value dw 0 ; DATA XREF: EXE_HEADER_sub_2+12w
register_sp_value dw 0 ; DATA XREF: EXE_HEADER_sub_2+E3w
; EXE_HEADER_sub_2+10Br
register_ss_value dw 0 ; DATA XREF: EXE_HEADER_sub_2+EDw
; EXE_HEADER_sub_2+10Fr
exe_cs_ip_ptr ptr16 <0> ; DATA XREF: EXE_HEADER_sub_2+FFw
; EXE_HEADER_sub_2+129r ...
; __int16 exe_pointer
exe_pointer ptr16 <0> ; DATA XREF: EXE_HEADER_sub_2+21w
; EXE_HEADER_sub_2+57r ...
; __int16 exe_header_pointer
exe_header_pointer ptr16 <0> ; DATA XREF: EXE_HEADER_sub_2+4Dw
; EXE_HEADER_sub_2+85r ...
start_psp dw 0 ; DATA XREF: start_0+11w start_0+8Fr
saved_int1_ptr ptr16 <0> ; DATA XREF: EXE_HEADER_sub_2+3Br
; start_0+9Er ...
saved_5_interrupt_pointers ptr16 5 dup(<0>) ; DATA XREF: start_0+B9o
; INIT_PART_init_stuff_sub_26+4Ao
main_menu_jump_table dw offset start_game ; DATA XREF: start_0+82r
dw offset select_gfx
dw offset shutdown_cleanup
config_tat_gfx_table_offset dw 0 ; DATA XREF: GFX_SELECT_MENU_sub_9+27r
; read_config_and_resize_memory+4Aw ...
; -------------------------------------------
;
;
;
; its a pointer to a uint16_t[5] table of offsets
;
; uint16_t* gfx_related_table
;
;
; contains (i think) the code offsets for each grafic card type in the progs.cc
;
;
;
;
;
; -------------------------------------------
config_tat_game_name_string dw 0 ; DATA XREF: MAIN_MENU_sub_8+1Cr
; MAIN_MENU_sub_8+35r ...
config_tat_publisher_string dw 0 ; DATA XREF: read_config_and_resize_memory+64w
; START_GAME_DOES_FILE_EXIST_sub_19+6Dr
config_tat_content_end dw 0 ; DATA XREF: read_config_and_resize_memory+7Ew
config_tat_filename db 'Config.tat',0 ; DATA XREF: read_config_and_resize_memory+5o
config_tat_disk_name_string dw 0 ; DATA XREF: read_config_and_resize_memory+71w
; SOME_PRINTING_TWO_sub_17+1Cr
config_tat_size dw 0 ; DATA XREF: read_config_and_resize_memory:loc_817w
some_feature_flags dw 1 ; DATA XREF: read_config_and_resize_memory+BCr
; read_config_and_resize_memory+C5w ...
;
;
;
; --------------------------
; bit[ 0] = ??? [active on startup]
; bit[ 1]
; bit[ 2]
; bit[ 3]
; bit[ 4]
; bit[ 5]
; bit[ 6]
; bit[ 7]
; bit[ 8]
; bit[ 9]
; bit[ 10]
; bit[ 11]
; bit[ 12] = joystick detected
; bit[ 13] = currency = franc
; bit[14+15] = mem size type?
; = 00 = 0 (< 0x4000 free paragraphs)
; = 01 = 1 (>= 0x4000 free paragraphs)
; = 10 = 2 (>= 0x6000 free paragraphs)
; = 11 = 3 (>= 0x8000 free paragraphs)
; -------------------------
text_video_seg dw 0B800h ; DATA XREF: SOME_PRINTING_TWO_sub_17+4r
; SOME_PRINTING_sub_18+Dr ...
text_x_offset db 0 ; DATA XREF: MAIN_MENU_sub_8+Bw
; GFX_SELECT_MENU_sub_9+Bw ...
text_y_offset db 0 ; DATA XREF: MAIN_MENU_sub_8+5w
; GFX_SELECT_MENU_sub_9+5w ...
subprogram_exit_code db 0 ; DATA XREF: GAME_START_sub_7+B3w
; start_0+32Fr
dos_version db 0 ; DATA XREF: start_0+1Aw
; interrupt_0x24r
grafic_type_supported_table db 5 dup(0) ; DATA XREF: GFX_SELECT_MENU_sub_9+18o
; GFX_SELECT_MENU_sub_9+23o ...
; ----------------------------
;
;
;
; 5 bytes for the 5 gfx cards in the gfx select menu
;
; gets filled first with 0xFF (not supported)
; and then with the corresponding grafic type nr
; only for checking if the pressed F-Key in SELEC_GFX_MENU
; is valid
;
;
;
;
;
; ---------------------------
word_752 dw 2 dup(0) ; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+1r
; START_GAME_IS_GFX_SUPPORTED_sub_12:loc_92r ...
; [0] = active display
; [1] = alternate display
current_dos_drive db 0 ; DATA XREF: START_GAME_DOES_FILE_EXIST_sub_19+14w
; START_GAME_DOES_FILE_EXIST_sub_19+5Ar
saved_video_mode db 0 ; DATA XREF: start_0+89r
; INIT_PART_init_stuff_sub_26+5w
; __int16 text_not_enough_memory
text_not_enough_memory db 2 dup(0Dh), 3, 10h, 4, 87h, 50h, 72h, 6Fh, 62h, 6Ch
; DATA XREF: START_GAME_FEATURE_FLAG_STUFF_sub_21-21o
db 65h, 6Dh, 5, 2 dup(0Dh), 4 dup(20h), 53h, 6Fh, 2 dup(72h)
db 79h, 2Ch, 6Eh, 6Fh, 74h, 20h, 65h, 6Eh, 6Fh, 75h, 67h
db 68h, 20h, 6Dh, 65h, 6Dh, 6Fh, 72h, 79h, 24h, 0C9h, 16h dup(0CDh)
db 0BBh, 0Dh, 0BAh, 4 dup(20h), 4, 87h, 4Ch, 6Fh, 61h
db 64h, 69h, 6Eh, 67h, 20h, 6 dup(2Eh), 5, 4 dup(20h)
db 0BAh, 0Dh, 0C8h, 16h dup(0CDh), 0BCh, 24h
; __int16 program_load_problem_msg_info
program_load_problem_msg_info db 2 dup(0Dh), 3, 10h, 4, 87h
; DATA XREF: read_config_and_resize_memory:loc_816o
; start_0:some_loading_msg_some_PPI_action_and_back_to_main_menuo
aProblem db 'Problem'
db 5, 2 dup(0Dh), 54h, 68h, 65h, 72h, 65h, 20h, 69h, 73h
db 20h, 61h, 20h, 70h, 72h, 6Fh, 62h, 6Ch, 65h, 6Dh, 20h
db 77h, 69h, 74h, 68h, 20h, 6Ch, 6Fh, 61h, 64h, 69h, 6Eh
db 67h, 20h, 74h, 68h, 65h, 0Dh, 70h, 72h, 6Fh, 67h, 72h
db 61h, 6Dh, 2Eh, 20h, 4Dh, 61h, 6Bh, 65h, 20h, 73h, 75h
db 72h, 65h, 20h, 74h, 68h, 61h, 74h, 20h, 74h, 68h, 65h
db 20h, 70h, 72h, 6Fh, 70h, 65h, 72h, 0Dh, 64h, 69h, 73h
db 6Bh, 20h, 69h, 73h, 20h, 69h, 6Eh, 20h, 74h, 68h, 65h
db 20h, 64h, 72h, 69h, 76h, 65h, 2Eh, 24h
; __int16 text_problem
text_problem db 2 dup(0Dh), 3, 10h, 4, 87h, 50h, 72h, 6Fh, 62h, 6Ch
; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+72o
db 65h, 6Dh, 5, 2 dup(0Dh), 59h, 6Fh, 75h, 20h
text_problem4 db 64h, 6Fh, 20h, 6Eh, 6Fh, 74h, 20h, 68h, 61h, 76h, 65h
db 0Dh, 61h
text_problem3 db 6Eh ; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12:loc_624w
db 20h
text_gfx_not_supported db 8 dup(53h), 20h, 63h, 61h, 72h, 64h, 20h, 69h, 6Eh
; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+58o
db 73h, 74h, 61h, 2 dup(6Ch), 65h, 64h, 0Dh, 6Fh, 72h
db 20h, 79h, 6Fh, 75h, 72h, 20h, 6Dh, 6Fh, 6Eh, 69h, 74h
db 6Fh, 72h, 20h, 0Dh, 64h, 6Fh, 65h, 73h, 20h, 6Eh, 6Fh
db 74h, 20h, 73h, 75h, 2 dup(70h), 6Fh, 72h, 74h, 20h
text_esc_or_space_message db 8 dup(53h), 2Eh, 0Dh, 50h, 72h, 65h, 2 dup(73h), 20h
; DATA XREF: START_GAME_IS_GFX_SUPPORTED_sub_12+60o
db 45h, 53h, 43h, 20h, 74h, 6Fh, 20h, 63h, 61h, 6Eh, 63h
db 65h, 6Ch, 2Ch, 20h, 53h, 50h, 41h, 43h, 45h, 20h, 74h
db 6Fh, 20h, 63h, 6Fh, 6Eh, 74h, 69h, 6Eh, 75h, 65h, 2Eh
db 2 dup(24h)
; __int16 text_main_menu2
text_main_menu2 db 0Dh, 20h, 0C9h, 0CDh, 2, 23h, 0BBh, 20h, 0Dh, 20h, 0BAh
; DATA XREF: MAIN_MENU_sub_8+44o
text_main_menu db 0Dh dup(20h), 48h, 4Fh, 53h, 54h, 41h, 47h, 45h, 10h dup(20h)
; DATA XREF: MAIN_MENU_sub_8+11o
db 0BAh, 20h, 0Dh, 20h, 0CCh, 0CDh, 2, 23h, 0B9h, 20h
db 0Dh, 20h, 0BAh, 20h, 2, 23h, 0BAh, 20h, 0Dh, 20h, 0BAh
db 0Ch dup(20h), 4Dh, 61h, 69h, 6Eh, 20h, 4Dh, 65h, 6Eh
db 75h, 0Fh dup(20h), 0BAh, 20h, 0Dh, 20h, 0BAh, 20h, 2
db 23h, 0BAh, 20h, 0Dh, 20h, 0BAh, 2 dup(20h), 46h, 31h
db 3 dup(20h), 47h, 61h, 6Dh, 65h, 19h dup(20h), 0BAh
db 20h, 0Dh, 20h, 0BAh, 2 dup(20h), 46h, 32h, 3 dup(20h)
db 53h, 65h, 6Ch, 65h, 63h, 74h, 20h, 76h, 69h, 64h, 65h
db 6Fh, 20h, 63h, 61h, 72h, 64h, 0Ch dup(20h), 0BAh, 20h
db 0Dh, 20h, 0BAh, 2 dup(20h), 46h, 33h, 3 dup(20h), 52h
db 65h, 74h, 75h, 72h, 6Eh, 20h, 74h, 6Fh, 20h, 44h, 4Fh
db 53h, 10h dup(20h), 0BAh, 20h, 0Dh
; __int16 press_a_function_key_text
press_a_function_key_text db 20h, 0BAh, 20h, 2, 23h, 0BAh, 20h, 0Dh, 20h, 0C8h, 0CDh
; DATA XREF: GFX_SELECT_MENU_sub_9+66o
db 2, 23h, 0BCh, 20h, 3 dup(0Dh), 3, 8, 0C9h, 16h dup(0CDh)
db 0BBh, 0Dh, 3, 8, 0BAh, 20h, 50h, 72h, 65h, 2 dup(73h)
db 20h, 61h, 20h, 46h, 75h, 6Eh, 63h, 74h, 69h, 6Fh, 6Eh
db 20h, 4Bh, 65h, 79h, 20h, 0BAh, 0Dh, 3, 8, 0C8h, 16h dup(0CDh)
db 0BCh, 24h
; __int16 select_video_card_text
select_video_card_text db 0Dh, 20h, 0C9h, 0CDh, 2, 23h, 0BBh, 20h, 0Dh, 20h, 0BAh
; DATA XREF: GFX_SELECT_MENU_sub_9+11o
db 8 dup(20h), 53h, 65h, 6Ch, 65h, 63h, 74h, 20h, 56h
db 69h, 64h, 65h, 6Fh, 20h, 43h, 61h, 72h, 64h, 0Bh dup(20h)
db 0BAh, 20h, 0Dh, 20h, 0CCh, 0CDh, 2, 23h, 0B9h, 20h
db 0Dh, 20h, 0BAh, 20h, 2, 23h, 0BAh, 20h, 24h
; __int16 byte_631
byte_631 db 0Dh, 20h, 0C9h, 0CDh, 2, 2Ah, 0BBh, 20h, 0Dh, 20h, 0BAh
; DATA XREF: SOME_PRINTING_THREE_sub_14+17o
db 20h, 2, 2Ah, 0BAh, 20h, 0Dh, 20h, 0CCh, 0CDh, 2, 2Ah
db 0B9h, 20h, 24h
; __int16 byte_632
byte_632 db 20h, 0BAh, 20h, 2, 2Ah, 0BAh, 20h, 24h
; DATA XREF: SOME_PRINTING_THREE_sub_14+21o
; __int16 byte_634
byte_634 db 20h, 0C8h, 0CDh, 2, 2Ah, 0BCh, 20h, 24h
; DATA XREF: SOME_PRINTING_THREE_sub_14+2Co
; __int16 press_a_key_text
press_a_key_text db 0C9h, 0CDh, 2, 14h, 0BBh, 0Dh, 0BAh, 5 dup(20h), 50h
; DATA XREF: SOME_PRINTING_show_msg_box_sub_13+7o
db 72h, 65h, 2 dup(73h), 20h, 61h, 20h, 4Bh, 65h, 79h ;
db 5 dup(20h), 0BAh, 0Dh, 0C8h, 0CDh, 2, 14h, 0BCh, 24h ;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
; byte_630 = grafic card selection
; ---------
; § F1 CGA 4 colors
; § F2 EGA 16 colors
; § F3 Tandy 16 colors
; § F4 VGA 16 colors
; § F5 HERCULES 2 colors
; ---------
grafic_card_types_text_offset dw 568h ; DATA XREF: GFX_SELECT_MENU_sub_9+3Dr
; the offsets at end are the switch HERCULES and VGA offsets
;
; cs:grafic_card_types_text_offset[n] is the offset to the grafic card text line
;
; CGA
dw 591h ; EGA
dw 5BAh ; TANDY
dw 60Ch ; HERCULES
dw 5E3h ; VGA
text_gfx_menu db 20h, 0BAh, 2 dup(20h), 46h, 31h, 3 dup(20h), 43h, 47h ;
db 41h, 6 dup(20h), 34h, 3 dup(20h), 63h, 6Fh, 6Ch, 6Fh ;
db 72h, 73h, 0Ah dup(20h), 0BAh, 20h, 24h, 20h, 0BAh, 2 dup(20h) ;
db 46h, 32h, 3 dup(20h), 45h, 47h, 41h, 6 dup(20h), 31h ;
db 36h, 2 dup(20h), 63h, 6Fh, 6Ch, 6Fh, 72h, 73h, 0Ah dup(20h) ;
db 0BAh, 20h, 24h, 20h, 0BAh, 2 dup(20h), 46h, 33h, 3 dup(20h) ;
db 54h, 61h, 6Eh, 64h, 79h, 4 dup(20h), 31h, 36h, 2 dup(20h) ;
db 63h, 6Fh, 6Ch, 6Fh, 72h, 73h, 0Ah dup(20h), 0BAh, 20h ;
db 24h, 20h, 0BAh, 2 dup(20h), 46h, 34h, 3 dup(20h), 56h ;
db 47h, 41h, 6 dup(20h), 31h, 36h, 2 dup(20h), 63h, 6Fh ;
db 6Ch, 6Fh, 72h, 73h, 0Ah dup(20h), 0BAh, 20h, 24h, 20h ;
db 0BAh, 2 dup(20h), 46h, 35h, 3 dup(20h), 48h, 45h, 52h ;
db 43h, 55h, 4Ch, 45h, 53h, 20h, 32h, 20h, 63h, 6Fh, 6Ch ;
db 6Fh, 72h, 73h, 0Ch dup(20h), 0BAh, 20h, 24h ;
;
; 5 (16bit offset) table in front
; each line is 41 bytes
; line-start+5 is the nr behind the F-Char
; § F1 CGA 4 colors § $
; § F2 EGA 16 colors § $
; § F3 Tandy 16 colors § $
; § F4 VGA 16 colors § $
; § F5 HERCULES 2 colors § $
; __int16 change_insert_disk_text
change_insert_disk_text db 2 dup(0Dh), 3, 0Bh, 4, 87h, 43h, 68h, 61h, 6Eh, 67h
; DATA XREF: START_GAME_DOES_FILE_EXIST_sub_19+9Bo
db 65h, 20h, 44h, 69h, 73h, 6Bh, 5, 2 dup(0Dh), 50h, 6Ch
db 65h, 61h, 73h, 65h, 20h, 69h, 6Eh, 73h, 65h, 72h, 74h
db 20h, 74h, 68h, 65h, 20h, 64h, 69h, 73h, 6Bh, 20h, 6Ch
db 61h, 62h, 65h, 6Ch, 65h, 64h, 0Dh
text_drive_name_placeholder db 20h dup(31h), 0Dh, 69h, 6Eh, 20h, 74h, 68h, 65h, 20h
; DATA XREF: START_GAME_DOES_FILE_EXIST_sub_19+7Fo
; START_GAME_DOES_FILE_EXIST_sub_19+8Ao
db 63h, 75h, 2 dup(72h), 65h, 6Eh, 74h, 20h, 64h, 72h
db 69h, 76h, 65h, 2Eh, 24h
; __int16 text_no_joystick_card_detected
text_no_joystick_card_detected db 2 dup(0Dh), 3, 10h, 4, 87h, 50h, 72h, 6Fh, 62h, 6Ch
; DATA XREF: JOYSTICK_STUFF_sub_29+1Bo
db 65h, 6Dh, 5, 2 dup(0Dh), 8 dup(20h), 4Eh, 4Fh, 20h
db 4Ah, 4Fh, 59h, 53h, 54h, 49h, 43h, 4Bh, 20h, 43h, 41h
db 52h, 44h, 20h, 44h, 45h, 54h, 45h, 43h, 54h, 45h, 44h
db 2Eh, 24h
text_joystick_calibration db 2 dup(0Dh), 3, 0Ah, 4Ah, 6Fh, 79h, 73h, 74h, 69h, 63h
; DATA XREF: JOYSTICK_STUFF2_sub_30+1Eo
db 6Bh, 20h, 43h, 61h, 6Ch, 69h, 62h, 72h, 61h, 74h, 69h
db 6Fh, 6Eh, 2 dup(0Dh), 50h, 6Ch, 65h, 61h, 73h, 65h
db 20h, 68h, 6Fh, 6Ch, 64h, 20h, 73h, 74h, 69h, 63h, 6Bh
db 20h, 61h, 74h, 20h, 70h, 6Fh, 73h, 69h, 74h, 69h, 6Fh
db 6Eh, 20h, 73h, 68h, 6Fh, 77h, 6Eh, 2Eh, 0Dh, 50h, 75h
db 73h, 68h, 20h, 61h, 63h, 74h, 69h, 6Fh, 6Eh, 20h, 62h
db 75h, 2 dup(74h), 6Fh, 6Eh, 20h, 61h, 6Eh, 64h, 20h
db 74h, 68h, 65h, 6Eh, 20h, 72h, 65h, 6Ch, 65h, 61h, 73h
db 65h, 2Eh, 0Dh, 48h, 6Fh, 6Ch, 64h, 20h, 73h, 74h, 69h
db 63h, 6Bh, 20h, 61h, 74h, 20h, 74h, 68h, 69h, 73h, 20h
db 70h, 6Fh, 73h, 69h, 74h, 69h, 6Fh, 6Eh, 20h, 75h, 6Eh
db 74h, 69h, 6Ch, 0Dh, 70h, 6Fh, 73h, 69h, 74h, 69h, 6Fh
db 6Eh, 20h, 72h, 65h, 71h, 75h, 65h, 73h, 74h, 20h, 63h
db 68h, 61h, 6Eh, 67h, 65h, 73h, 2Eh, 24h
; __int16 text_joystick_calibrate_success
text_joystick_calibrate_success db 20h, 0C9h, 3 dup(0CDh), 0BBh, 20h, 0Dh, 20h, 0BAh
; DATA XREF: JOYSTICK_STUFF2_sub_30+47o
; JOYSTICK_STUFF2_sub_30+7Bo ...
byte_378 db 20h ; DATA XREF: JOYSTICK_STUFF2_sub_30+39w
; JOYSTICK_STUFF2_sub_30+77w ...
db 2 dup(20h), 0BAh, 20h, 0Dh, 20h, 0BAh, 20h
byte_376 db 20h ; DATA XREF: JOYSTICK_STUFF2_sub_30+43w
; JOYSTICK_STUFF2_sub_30+6Dw ...
db 20h, 0BAh, 20h, 0Dh, 20h, 0BAh, 2 dup(20h)
byte_377 db 20h ; DATA XREF: JOYSTICK_STUFF2_sub_30+3Fw
; JOYSTICK_STUFF2_sub_30+73w ...
db 0BAh, 20h, 0Dh, 20h, 0C8h, 3 dup(0CDh), 0BCh, 20h, 24h
text_joystick_calibrated_success2 db 2 dup(0Dh), 3, 10h, 47h, 2 dup(4Fh), 44h, 20h, 4Ah
; DATA XREF: JOYSTICK_STUFF2_sub_30+115o
db 4Fh, 42h, 20h, 2 dup(0Dh), 3, 8, 4Ah, 6Fh, 79h, 73h
db 74h, 69h, 63h, 6Bh, 20h, 6Eh, 6Fh, 77h, 20h, 43h, 41h
db 4Ch, 49h, 42h, 52h, 41h, 54h, 45h, 44h, 20h, 21h, 0Dh
db 3, 8, 50h, 72h, 65h, 2 dup(73h), 20h, 61h, 20h, 4Bh
db 65h, 79h, 20h, 6Fh, 72h, 20h, 74h, 68h, 65h, 20h, 42h
db 75h, 2 dup(74h), 6Fh, 6Eh, 24h
; __int16 text_joystick_calibration_error
text_joystick_calibration_error db 2 dup(0Dh), 3, 10h, 4, 87h, 50h, 72h, 6Fh, 62h, 6Ch
; DATA XREF: JOYSTICK_STUFF2_sub_30+104o
db 65h, 6Dh, 5, 2 dup(0Dh), 3, 0Ah, 43h, 61h, 6Ch, 69h
db 62h, 72h, 61h, 74h, 69h, 6Fh, 6Eh, 20h, 45h, 2 dup(52h)
db 4Fh, 52h, 20h, 21h, 0Dh, 3, 7, 50h, 6Ch, 65h, 61h, 73h
db 65h, 2Ch, 63h, 68h, 65h, 63h, 6Bh, 20h, 79h, 6Fh, 75h
db 72h, 20h, 6Ah, 6Fh, 79h, 73h, 74h, 69h, 63h, 6Bh, 2Eh
db 24h
; =============== S U B R O U T I N E =======================================
; void __usercall offset_overflow_safe_block_copy(__int16 dest_seg_@<es>, __int16 dest_ofs_@<di>, __int16 src_seg_@<ds>, __int16 src_ofs_@<si>, __int16 lo_size_@<cx>, __int16 hi_size_@<bx>)
offset_overflow_safe_block_copy proc near ; CODE XREF: EXE_HEADER_sub_2+8Ep
; EXE_HEADER_sub_2+B2p
push ds
push es
push si
push di
push bx
push cx
cld
loc_556: ; CODE XREF: offset_overflow_safe_block_copy+47j
mov ax, si
shr ax, 1
shr ax, 1
shr ax, 1
shr ax, 1
mov dx, ds
add dx, ax
mov ds, dx
and si, 0Fh
mov ax, di
shr ax, 1
shr ax, 1
shr ax, 1
shr ax, 1
mov dx, es
add dx, ax
mov es, dx
and di, 0Fh
mov ax, 512
sub cx, ax
sbb bx, 0
jnb short loc_555
add ax, cx
xor bx, bx
xor cx, cx
loc_555: ; CODE XREF: offset_overflow_safe_block_copy+35j
push cx
mov cx, ax
rep movsb
pop cx
mov ax, cx
or ax, bx
jnz short loc_556
pop cx
pop bx
pop di
pop si
pop es
pop ds
retn
offset_overflow_safe_block_copy endp
; =============== S U B R O U T I N E =======================================
; __int16 __usercall __far EXE_HEADER_sub_2<ax>(__int16 unknown1_@<ax>, __int16 unknown2_@<dx>, __int16 unknown3_@<cx>, __int16 unknown4_@<bx>, __int16 unknown5_@<ds>, __int16 unknown6_@<si>, __int16 unknown6_@<es>, __int16 unknown7_@<di>)
EXE_HEADER_sub_2 proc far ; CODE XREF: GAME_START_sub_7+9Bp
push bx
test cs:byte_55, 0C0h
jnz short loc_557
xor ax, ax
clc
pop bx
retn ; near ret from far proc - manually fixed stack?
; ---------------------------------------------------------------------------
loc_557: ; CODE XREF: EXE_HEADER_sub_2+7j
mov cs:word_558, ax ; something with someway_cs_registe_value1 - lea instruction
mov cs:some_register_cs_value, dx ; = cs
mov cs:word_62, cx ; = some_game_ptr.ofs
mov cs:some_game_pointer_seg, bx ; = some_game_ptr.segm
mov cs:exe_pointer.ofs, si ; = 0
mov cs:exe_pointer.segm, ds ; = somway_exe_buffer_seg + 10h
mov ah, 50h
mov bx, cs:new_psp_seg
int 21h ; DOS - 2+ internal - SET PSP SEGMENT
; BX = segment address of new PSP
push es
push ax
push ds
xor ax, ax
mov es, ax
assume es:nothing
lds ax, dword ptr cs:saved_int1_ptr.ofs ; restore interrupt 1 vector
mov es:4, ax
mov word ptr es:6, ds
pop ds ; src_seg_@
pop ax
pop es ; dest_seg_@
assume es:nothing
cld
mov cs:exe_header_pointer.ofs, di
mov cs:exe_header_pointer.segm, es
lds si, dword ptr cs:exe_pointer.ofs ; unknown_@
test cs:byte_55, 40h
jz short loc_560
jmp loc_561
; ---------------------------------------------------------------------------
loc_560: ; CODE XREF: EXE_HEADER_sub_2+62j
cmp [si+EXE_Header.signature], 'ZM' ; 'MZ' or 'ZM' exe header signature??
jz short loc_562
stc ; no exe header found
pop bx
retn ; near ret from far proc - manually fixed stack?
; ---------------------------------------------------------------------------
loc_562: ; CODE XREF: EXE_HEADER_sub_2+6Bj
mov bx, [si+EXE_Header.headersize] ; exe Header size
xor ax, ax
shl bx, 1 ; bx *= 2;
rcl ax, 1
shl bx, 1 ; bx *= 2;
rcl ax, 1
shl bx, 1 ; bx *= 2;
rcl ax, 1
shl bx, 1 ; bx *= 2;
rcl ax, 1 ;
;
; ==> bx *= 16
; ==> ax contains the hi word
;
; results in a 32bit numbers in ax:bx
;
; uint32_t result = header_paragraphs * 16;
; ax == (result >> 16)); HI
; bx == (result & 0xFFFF)); LO
les di, dword ptr cs:exe_header_pointer.ofs ; dest_ofs_@
mov cx, bx ; lo_size_@
mov bx, ax ; hi_size_@
call offset_overflow_safe_block_copy
mov dx, bx
mov si, cx ; src_ofs_@
mov bx, cs:some_game_pointer_seg
mov cx, cs:word_62
sub cx, si ; lo_size_@
sbb bx, dx ; hi_size_@
mov cs:some_game_pointer_seg, bx
mov cs:word_62, cx
les di, dword ptr cs:exe_pointer.ofs ; dest_ofs_@ -> here is the full exe image
call offset_overflow_safe_block_copy
mov bp, es ; bp = es = load segment = exe_pointer.segm
les bx, dword ptr cs:exe_header_pointer.ofs ; relocate exe segments starts here
mov cx, es:[bx+EXE_Header.relocations]
jcxz short loc_563
mov di, es:[bx+EXE_Header.reloctable]
add di, bx
do_relocate: ; CODE XREF: EXE_HEADER_sub_2+D8j
mov si, es:[di+ptr16.ofs]
mov ax, es:[di+ptr16.segm]
add ax, bp
mov ds, ax
add [si], bp ; bp = load_segment
add di, 4
loop do_relocate
loc_563: ; CODE XREF: EXE_HEADER_sub_2+C0j
les si, dword ptr cs:exe_header_pointer.ofs
mov ax, es:[si+EXE_Header.initSP]
mov cs:register_sp_value, ax
mov ax, es:[si+EXE_Header.initSS]
add ax, bp
mov cs:register_ss_value, ax
mov ax, es:[si+EXE_Header.initCS]
add ax, bp
mov cs:exe_cs_ip_ptr.segm, ax
mov ax, es:[si+EXE_Header.initIP]
mov cs:exe_cs_ip_ptr.ofs, ax
mov es, cs:new_psp_seg
cld
mov di, es
mov ax, cs:register_sp_value
mov dx, cs:register_ss_value
mov cx, cs:word_62
mov bx, cs:some_game_pointer_seg
cli
mov ss, dx ;
;
; --
;
; prepare registers for exe start
;
;
; --
mov sp, ax
mov ds, di
xor ax, ax
push ax
sti
jmp dword ptr cs:exe_cs_ip_ptr.ofs ; jump into game code
; ---------------------------------------------------------------------------
loc_561: ; CODE XREF: EXE_HEADER_sub_2+64j
cli
mov ax, cs:new_psp_seg
mov es, ax
mov ds, ax
mov ss, ax
mov sp, 0FFFFh
xor bx, bx
push bx ; push 0
push ax ; push CS value for retf-jmp
;
; installes the sound TSRs to Interrupt-0xF0
; i think only one is active at a time
;
; 3 retf-jumps are triggered
;
; <-- ax:100h
; 1. Adlib 'IFGM ADLIB'
; 2. Tandy 'IFGM TANDY PSG'
; 3. ADLIB 'IFGM BUZER PC'
;
; then starts the game with the jump above
mov ax, size sPSP ; maybe PSP size
push ax ; push IP value for retf-jmp
mov ax, bx
mov cx, bx
mov dx, bx
mov bp, bx
mov si, bx
mov di, bx
sti
retf ; <----------- RETF-JUMP!!!!
EXE_HEADER_sub_2 endp ;
; returns using old-school-interrupt 22h
;
; target setted in:
;
; GAME_START_sub_6, seg000:0E0A
; mov word ptr ds:sPSP.int_22.segm, cs
; mov word ptr ds:sPSP.int_22, offset subprogram_exit
;
; back into subprogram_exit:
;
; https://wiki.osdev.org/Far_Call_Trick
;
; --------
; =============== S U B R O U T I N E =======================================
; __int16 __usercall GAME_START_sub_3<ax>(__int16 maybe_dest_seg_@<es>, __int16 maybe_dest_ofs1_@<di>, __int16 maybe_src_seg_@<ds>, __int16 maybe_src_ofs_@<si>)
GAME_START_sub_3 proc near ; CODE XREF: GAME_START_sub_3+101j
; read_some_file_sub_4+1EDp
push es
push di
mov cx, 128
mov ax, ds
mov es, ax
assume es:seg000
mov di, 301h ; its not in seg000!!!
xor ax, ax
rep stosw
pop di
pop es
assume es:nothing
push es
xor ax, ax
mov es, ax
assume es:nothing
sub di, es:4
pop es
assume es:nothing
mov ax, di
shr ax, 1
shr ax, 1
shr ax, 1
shr ax, 1
mov cx, es
add cx, ax
mov es, cx
and di, 0Fh
push es
xor ax, ax
mov es, ax
assume es:nothing
add di, es:4
pop es
assume es:nothing
push ds
push es
push si
push di
mov cx, 4
mov di, offset byte_57 ; byte_57 holds 4 bytes - see rep movsb
mov ax, cs
mov es, ax
assume es:seg000
lds si, dword ptr cs:another_pointer2.ofs
mov ax, si
shr ax, 1
shr ax, 1
shr ax, 1
shr ax, 1
mov dx, ds
add ax, dx
mov ds, ax
and si, 0Fh
mov cs:another_pointer2.ofs, si
mov cs:another_pointer2.segm, ds
add cs:another_pointer2.ofs, cx
rep movsb
pop di
pop si
pop es
assume es:nothing
pop ds
mov dx, cs:word_60
inc dx
cmp cs:byte_57, 0
jnz short loc_565
jmp loc_566
; ---------------------------------------------------------------------------
loc_565: ; CODE XREF: GAME_START_sub_3+82j
push ds
push es
push di
xor ch, ch
mov cl, cs:byte_57
mov di, 201h
mov ax, ds
mov es, ax
assume es:seg000
mov ds, cs:another_pointer2.segm
mov si, cs:another_pointer2.ofs
add cs:another_pointer2.ofs, cx
rep movsb
mov cl, cs:byte_57
xor ch, ch
mov di, 1
add cs:another_pointer2.ofs, cx
rep movsb
mov cl, cs:byte_57
mov di, 101h
add cs:another_pointer2.ofs, cx
rep movsb
pop di ; maybe_dest_ofs1_@
pop es ; maybe_dest_seg_@
assume es:nothing
pop ds ; maybe_src_seg_@
xor ch, ch
mov cl, cs:byte_57
xor ah, ah
mov bx, 1
loc_567: ; CODE XREF: GAME_START_sub_3+EBj
mov al, [bx+200h]
mov si, ax ; maybe_src_ofs_@
mov dl, [si+301h]
mov [bx+402h], dl
mov [si+301h], bl
inc bx
loop loc_567
mov dx, cs:word_60
inc dx
mov cx, 1
loc_124: ; CODE XREF: GAME_START_sub_3+123j
; GAME_START_sub_3+16Ej
dec dx
jnz short loc_568
loc_577: ; CODE XREF: GAME_START_sub_3+192j
cmp cs:byte_569, 0
jz short locret_570
jmp GAME_START_sub_3
; ---------------------------------------------------------------------------
locret_570: ; CODE XREF: GAME_START_sub_3+FFj
retn
; ---------------------------------------------------------------------------
loc_568: ; CODE XREF: GAME_START_sub_3+F7j
push ds
mov si, cs:another_pointer2.segm
mov ds, si
mov si, cs:another_pointer2.ofs
lodsb
mov cs:another_pointer2.ofs, si
pop ds
mov bx, ax
cmp byte ptr [bx+301h], 0
jnz short loc_571
stosb
jmp short loc_124
; ---------------------------------------------------------------------------
loc_571: ; CODE XREF: GAME_START_sub_3+120j
mov bl, [bx+301h]
xor ax, ax
push ax
jmp short loc_128
; ---------------------------------------------------------------------------
loc_129: ; CODE XREF: GAME_START_sub_3+164j
; GAME_START_sub_3+174j
mov bp, ax
cmp byte ptr ds:[bp+301h], 0
jz short loc_572
cmp bl, ds:[bp+301h]
ja short loc_573
mov al, bl
mov bl, ds:[bp+301h]
loc_575: ; CODE XREF: GAME_START_sub_3+152j
mov bl, [bx+402h]
or bl, bl
jz short loc_574
cmp bl, al
jb short loc_128
jmp short loc_575
; ---------------------------------------------------------------------------
loc_573: ; CODE XREF: GAME_START_sub_3+13Dj
mov bl, ds:[bp+301h]
loc_128: ; CODE XREF: GAME_START_sub_3+12Cj
; GAME_START_sub_3+150j
mov al, [bx+100h]
mov ah, bl
push ax
xor ah, ah
mov al, [bx]
jmp short loc_129
; ---------------------------------------------------------------------------
loc_574: ; CODE XREF: GAME_START_sub_3+14Cj
mov ax, bp
loc_572: ; CODE XREF: GAME_START_sub_3+136j
stosb
pop ax
or ax, ax
jnz short loc_576
jmp short loc_124
; ---------------------------------------------------------------------------
loc_576: ; CODE XREF: GAME_START_sub_3+16Cj
mov bl, ah
xor ah, ah